function s1_hello(){
echo "hello,world!"
}
function s2_tell_who_i_am(){
whoami
}
function which_distro_do_i_use(){
cat /etc/os-release | grep ^PRETTY_NAME | cut -d= -f2 | te -d '"'
}
function view_my_cpu_arch(){
uname-m
}
function show_first_scsi_disk_size(){
lsblk-1| \grep disk|\grep'^sda'|awk'{print $4}'
}
function show_main_memory_size_in_megabytes(){
free-m|grep"Mem:"|awk'{print $2}'
}

